ZyXEL Communications U-336R/RE specification

T401 Timeouts and T402 Timeouts

These are for the manufacturer checking link layer operation. T401 and T402 are timers used in MNP4 or V.42. T402 will count when the modem is connected in the idle state with no data to transmit or receive.

FCS Errors

Frame CheckSum Errors/number of block errors. A lot of FCS errors indicate a bad line.

Round Trip Delay

Round trip delay between modems in T (1/2400 sec) units. Normally should be in the range of 0-100. A satellite link will introduce a delay of about 1300 T.

Xmitter Underrun

Number of times the modem fails to provide data octet in time for transmission.

Receiver Overrun

Number of times the modem fails to take data octet in time from receiver.

Last speed/protocol

The speed and protocol of the link before hang-up. It may be different from the initial speed because of retrain and speed fall- back or fall-forward. Speed change is a clue to changing line conditions.

Disconnect Reason

∙Local Hang-up

∙Remote Hang-up

∙Carrier Lost

∙On Line

Diagnostics & Troubleshooting 125

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ZyXEL Communications U-336R/RE manual ∙ Local Hang-up ∙ Remote Hang-up ∙ Carrier Lost ∙ On Line

Contents

ZyXEL ZyXEL Limited Warranty Copyright 1997 by ZyXEL FCC Part 15 InformationAcknowledgments Iii Information for Canadian Users Page ∙ E-mail Contacting ZyXEL Vii Contents Leased Line Operation Synchronous Mode Operation Fax Operation Special Functions Diagnostics & Troubleshooting AT Command Set SummariesStatus Registers & Result Codes Upgrading Your Modem Xii Terminal PinoutsIndex Introduction Modem FeaturesStandard Features Intelligent Features Fax Compatibility Technical Specifications Required Equipment Unpacking Your ModemEnclosed Equipment Becoming a Registered Owner Introduction Installation Installation336R/RE Modem Card Name Blinking RXD TXDDTR DSR Required Steps for U-336R/RE Installation Connect to phone lines Installing the modem card Connect to Computers Hooking Up PowerFax/Modem Communication Software Installation AT&F Setting Value For troubleshooting suggestions Installation Using the Windows 95 Hyper Terminal Program Understanding AT CommandsBasic Modem Operation Basic Modem Operation ATEnter Dialing and Answering Techniques Dialing using the ATD Command Auto-Answer and Hook Controls Making Your First ConnectionATS0=n ATS0=0 Quick Tips when issuing AT Commands AT Command Set/Type Example Command Description Modem Result Codes Changing S Register Values Viewing S Register Values Storing Phone Numbers Non-Volatile MemoryDialing Stored Phone Numbers AT&Zs=n Helpful Hints for PC Computers Saving Settings and User Profiles ZyXEL Serial/Parallel I/O Card Default Modem Settings for PC’sAT Command Description Helpful Hints for Macintosh Computers Special AT Command Settings for MacintoshMacintosh Serial Port Mac Software Tips Serial Cable Basic Modem Settings for UnixHelpful Hints for UNIX-Based Computers Unix Software Tips Synchronous Mode Operation Synchronous Mode Operation25bis Command Set Clock Options Syntax Command with Description Parameters RTS Options Dialing from Synchronous Mode Command State OptionsSync AT&M1 Data Manual Answer Answering from Synchronous ModeAuto-Answer Synchronous Mode Operation Line Type Setting Connecting to a Leased LineAT-Command Description Leased Line Operation Leased Line Handshaking Power Level SettingManual Connect Auto Handshake Dial Backup Leased-Line Dial BackupAT*M0 AT*M1 Aborting from Leased-Line Operation Terminating a Leased Line Connection Security Functions Special FunctionsLevels of Security Special Functions User Passwords Enters the callback number Command Function AT*Wab Remote ConfigurationAT*Rab Caller Number Delivery Caller ID Ring Here is an example Distinctive Ring Type Bit Ring Sequence Extended Distinctive Ring EDR Special Functions S51 Bit-mapped register default Bits Bin Dec Description Setting Up EDR CID/EDR RD EDR Application Example Special Functions Special Functions Fax Operation Fax OperationModem as Fax Machine ITU-T T.30 Fax Protocol Fax Command setsDefining the Fax Command Sets Command Value Description Class 1 Command Set +FTH and +FRH support value 3 V.21 ch / 300 bps only Class 2 Command Set +FCIG=string Command Syntax DescriptionValue Ln,df,ec,bf,st +FDCC=vr,br,wd +FDIS=vr,br,wd,l +FDCS=vr,br,wdDf,ec,bf,st +FDR +FLID=string +FK+FMDL? +FMFR? +FCFR +FREV?Response Value Function and Description +FVOICE +FPOLL +FBS? Class 2.0 Command Set+FCC=vr,br,w +FCO +FDT Tpr,idr,nsr +FIS=vr,br,wd+FLI=string +FPI=string +FNS=stringDCE +FRQ=pgl,cbl +FCICSI ID HEX +FNC A0-BFNSC FIF +FNF NSS FIF +FNS+FPI CIG ID Extended Fax AT Command Set Modem will wait for DC2 at the beginning of every No Dial #PstringTone No Carrier Busy Pstring Field DescriptionSnnnn Flow Control Connect String Error LevelFax Reception from a BBS Init AT&FX7S0=1#B1+FCLASS=6 ExtrnMail ZyXEL errorlevel Basic AT Command Set AT Command Set SummariesCommand Options Function & Description AT Command Set Summaries Command Options Function & Description UPX Link Status Report output appears as follows Description of ATI2 Output Output Parameter Output Value Description Data Type Description DTE DTE/DCE Extended AT& Command Set Command Options Function & Description Command Options Function & Description Command Options Function & Description Command Options Function & Description Command Options Function & Description Extended AT* Command Set Command Options Function & Description Command Options Function & Description Status Registers & Result Codes Command Function & Description +RefRegister Descriptions Basic S-Registers ATSn=x Extended S-Registers ATSn=x Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description ATX1 ATX2 ATX3 ATX4 Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description ATA Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Command Bit Dec Hex Function and description Register bit number, b, used in ATSr.b=n ATSr.b=? +nnn Result Code OptionsATXn Result Code Option Table Supported Result Code Field Descriptions Connect Strings for Error Corrected ConnectionsField Name Possible Values Numerical Verbose 24000 Status Registers & Result Codes Diagnostics & Troubleshooting Diagnostics & TroubleshootingDiagnostics Power-On Self Test FR Calibration Loopback Tests Indicator Lights Line Condition Status Display Received Signal Power Level RX Link Status Report ATI2 Characters sent from the DTE to the modem for transmission Data bytes sent to the remote modem ∙ Local Hang-up ∙ Remote Hang-up ∙ Carrier Lost ∙ On Line AT Command Set Problems Trouble Shooting Your modem fails to execute AT commands Answer Problems Command Echo Problems Dialing Problems Connect Problems Data Transfer Problems Upgrading by Flash Eprom Upgrading Your ModemType ATUPXenter Upgrading Your Modem Kernel Recovery Mode Terminal Blocks Terminal PinoutsTIP Terminal Pinouts PC Serial Port Pinouts Pin/Signal Direction DescriptionSigna Name Mac Modem Description Din Macintosh Serial Port Pinouts Terminal Pinouts Index Index Smartdrv